Xfrm needs support the same xsave feature in encalve as in OS.
By cpuid, it can get the same value between xfrm and xcr0.
Signed-off-by: NLiang Yang <liang3.yang@intel.com>
Reviewed-by: Jia Zhang <zhang.jia@linux.alibaba.com>

sgxsign now supports --product option to enable product enclave build and launch.
Signed-off-by: NShirong Hao <shirong@linux.alibaba.com>

This new implementation inspires the design of https://github.com/jsakkine-intel/linux-sgx/tree/next/tools/testing/selftests/x86/sgx, which is a real enclave runtime.
Signed-off-by: Njack.wxz <wangxiaozhe@linux.alibaba.com>